<template>
  <nav
    v-if="userLinks.length || repoLink"
    class="nav-links"
    :class="[{ 'home-links': $page.frontmatter.home }]"
  >
    <!-- user links -->
    <div
      v-for="item in userLinks"
      :key="item.link"
      class="nav-item"
    >
      <DropdownLink
        v-if="item.type === 'links'"
        :item="item"
      />
      <NavLink
        v-else
        :item="item"
      />
    </div>

    <!-- repo link -->
    <a
      v-if="repoLink"
      :href="repoLink"
      class="repo-link"
      target="_blank"
      rel="noopener noreferrer"
    >
      {{ repoLabel }}
    </a>
  </nav>
</template>

<script>
import DropdownLink from '@theme/components/DropdownLink.vue'
import { resolveNavLinkItem } from '../util'
import NavLink from '@theme/components/NavLink.vue'

export default {
  name: 'NavLinks',

  components: { NavLink, DropdownLink },

  computed: {
    userNav() {
      return this.$themeLocaleConfig.nav || this.$site.themeConfig.nav || []
    },

    nav() {
      const { locales } = this.$site
      if (locales && Object.keys(locales).length > 1) {
        const currentLink = this.$page.path
        const routes = this.$router.options.routes
        const themeLocales = this.$site.themeConfig.locales || {}
        const languageDropdown = {
          text: this.$themeLocaleConfig.selectText || 'Languages',
          ariaLabel: this.$themeLocaleConfig.ariaLabel || 'Select language',
          items: Object.keys(locales).map(path => {
            const locale = locales[path]
            const text = themeLocales[path] && themeLocales[path].label || locale.lang
            let link
            // Stay on the current page
            if (locale.lang === this.$lang) {
              link = currentLink
            } else {
              // Try to stay on the same page
              link = currentLink.replace(this.$localeConfig.path, path)
              // fallback to homepage
              if (!routes.some(route => route.path === link)) {
                link = path
              }
            }
            return { text, link }
          }),
        }
        return [...this.userNav, languageDropdown]
      }
      return this.userNav
    },

    userLinks() {
      return (this.nav || []).map(link => {
        return Object.assign(resolveNavLinkItem(link), {
          items: (link.items || []).map(resolveNavLinkItem),
        })
      })
    },

    repoLink() {
      const { repo } = this.$site.themeConfig
      if (repo) {
        return /^https?:/.test(repo)
          ? repo
          : `https://github.com/${repo}`
      }
      return null
    },

    repoLabel() {
      if (!this.repoLink) return
      if (this.$site.themeConfig.repoLabel) {
        return this.$site.themeConfig.repoLabel
      }

      const repoHost = this.repoLink.match(/^https?:\/\/[^/]+/)[0]
      const platforms = ['GitHub', 'GitLab', 'Gitee', 'Bitbucket']
      for (let i = 0; i < platforms.length; i++) {
        const platform = platforms[i]
        if (new RegExp(platform, 'i').test(repoHost)) {
          return platform
        }
      }

      return 'Source'
    },
  },
}
</script>

<style lang="stylus">
.nav-links
  display flex
  align-items center
  justify-content center
  color $textColor
  font-size 1rem

  &.home-links
    color #fff

    .nav-link,
    .repo-link
      &:hover,
      &.router-link-active
        color #fff

  a
    color inherit
    transition all 0.25s

    &:hover,
    &.router-link-active
      color $accentColor

  .nav-item
    position relative
    padding 0 1.2rem

    &:first-child
      margin-left 0

  .repo-link
    padding 0 1.2rem

@media (max-width $MQMobile)
  .nav-links
    &.home-links
      color $textColor

    .nav-item,
    .repo-link
      margin-left 0

@media (min-width $MQMobile)
  .nav-links a
    &:hover,
    &.router-link-active
      color $accentColor

  .nav-item > a:not(.external)
    &:hover,
    &.router-link-active
      margin-bottom -2px
</style>
